Automatic stop for presses



Sept. 21 192a. igmz is Sept. 21 1926. 1,600,256

H. C. STQLL.

AUTOMATIC STOP FOR PRESSES 4 Filed August a. 1921 5 sheets sheet 2 H. "c. STOLL M W [I W v w &.W

2W lv/v kw 1' g V v\ m NYQM. {Q Q plishi g Patented Sept. 21, 1926.

UNITED STA TES PATENT OFFICE. f

HENRY c. STOLL, or NEW YORK, N. Y., ASSIGNOR ro'AMnmoAN can COMPANY, on.

NEW YORK, N. Y., A com 1 ORATION OF NEW JERSEY.

AUTOMATIC s'ror ron'rnnssns.

Application filed'August 8, 1921, Serial No. 490,508.

This invention relates in general to presses such as are generally upon sheet metal used in operating blanks and 'the like, and refers more particularly to an alltOHlfltlC stop device for machines of this character adapted to operate in a predetermined event. A principal object of the'invent on 1s the provision of an automatic stopping device which is sensitive and accurate in operat on and adapted to function with certainty to stop thev action of the machine under conditionslikely to cause machine or damage thereto.

A particular ob ect of the breakage of parts of the invention is the provision of a device of-this character adapted to operate in the-event of the accidental v depositing in the press of a greater number' of blanks than the operating mechanism is able to accommodate with distortion or breakage thereof.

A further 'objectof the invention is the provision of a safety device of thecharacter; described which is adjustable in such manner as to be operable in case of the presence ofany predetermined blanks.

number of Still another object of the invention is the provision of a mechanism for accomthe foregoing objects which in no way mterferes with the-normal operation of the'machine, I struction and adapted to ficiently cooperate with and which is simple in conefi'ectively and efthe regularly em.-

ployed parts of a machine oft-his general character.

Numerous other objects and advantages will be apparent as it is of the invention better understood from the following description, which, taken in connection with the accompanying drawings, disclosesa preferred embodiment thereof.

Referring to the drawings Figure 1 is a side elevati'onof a double.

action draw press upon whichmy invention is employed;

lug. 21s an enlarged" plan view partly in section taken substantially on the line 22 ofFig.1; Fig. 3 is an enlarged vertical section taken sub'stantiallyon the line 33 of Fig 1; and

Fig. 4 is an enlarged substantially on detail section taken the line 4.4 of Fig. 2.

Fig. 5 is a vertical sectional :view taken on a plane at angles to the plane of F ig. 4 and illust ating the parts18, 19, 5 1

and 54:.

For the purpose of illustrating my inven-s tion I have shown in the drawings a press 7 having a pedestal support 11, a body frame tion in a well known manner to draw'or form can covers or other. desired articles from blanks successively fed thereto.

. In the ordinary course or operation of a machine of this characterv it sometimes happens that more than. one blank is, accidentally deposited upon the lower diemember with the result that upon the next subseuent action of the die parts the crank s aft or some other part of the machine is broken or damaged by the strain which the extra thickness of-metal' imposes upon said parts. I have, therefore, provided mechanism, tobe hereinafter described, which serves to automatically stop the operation of the machine when more than one, or any i In operation the blanksarefed ontothe die member 17 and over an aperture 24 thereblanks, are fed to".

in. The member 17 rests upon a sub-bolster 25 which has screw threaded supporting engagement with the pressure screw 19. Upon operation of the .die .parts the blank 26 is formed, as indicated in Fig. 4, and in the usual course is'ejected without stopping the action of. the machine;

are.present,however, therod 18 is actuated to set in motion the parts of-the stopping device,..to be hereinafter described, thereby protecting the machine from the' damage which probably would ensue from continued operation. It will be underst'ood that a oer" tain amountof play' is allowed at the point 27 between the sub-bolster 25 and "the; die

bottomor plunger23. This, with the resilience of the pressure rubber 21, prevents any In case two blanks harmful results from the operation of the die parts upon two blanks and is sufficient also to permit operation of the detector rod by increased pressure thereon due to the double thickness of the metal between the die parts. The upperend of the rod 18 is provided with a shoulder 28 upon which the die bottom 23 is adapted to opera-tein the event mentioned. 7

It will be noted that'the lower end '29 of the detector rod-rests upon a set screw 31 I secured by means of a screw 49.

which extends through a lug32 protruding from alever 33, this lever being. supported by apin 34 extending through bearings 35 I I Secured in the opposite side of the bracket 36 by means projecting from a bracket 36.

of a pin '37 is a treadle lift lever 38 having one arm 39 to which a connecting rod 41 s secured by means of a rcotter pin 42,- and this rod has connection, adjustable by the set screw 43,'with the treadle lever 15. The lift lever 38 has also a vertical'arm45 carrying at its lower end a release pin 46 cut away "in its vupper portion to provide a face 47 adapted to cooperate with a pawl 48 extending from. the lever 33 to which it is 33 has a depending socket projection 51 for the reception'of a release spring 52, one end ofwhich bears against the vertical arm of the leverv 38 and is held in place by means of a projection 53 extending into the spring.

' It will be seen'that in this manner constant pressure is exerted upon the arm 45 tending to lift the treadle 14 through the connecting rods 41 and 15.

Depression of the foot pedal or treadle 14- by the foot of the operator serves to start the operation of the machine and alsoilocks the automatic stopping mechanism just de scribed by forcing the locking face 47 of the pin 46 behind the cooperating face of the pawl 48. The action of the machine may now continue until stopped by hand through pulling downwardly upon the adjusting screw 31, or by the automatic action of my stopping device. I

' It will be observed that the lever 33 is pivotally mountedupon the pin 34 and that downward movement of the rod 18 serves to raise the pawl 48 projecting from the end I of the lever opposite that carrying the adlever 38 about its axis justing screw 31, thereby permitting the tension of the spring 52 to move the lift.

I on: the pin 37, lifting the control pedal 14 and throwing the machine out of operation. It will be readily understood that by adjustmentof the screw 31 the amount ofplay between the parts 23 and 25 may be coordinated'with the action of thefpawl 48-so thatthe stop mechanism I I maybe caused-tooperateby a greater or "less number of blanks in i the die parts.

Thus, it maybeso adjusted that a single thickness of metal would cause operation of 'theform hereinbefore The lever said mechanism or so that several thicknesses would be required. I V

The rod 18, it will be seen,-1s under con- I stant upward stress through the force of the spring 52, and/positive.pressure thereon is required to release the pawl 48. Sliding movement of said rod is limited by a screw "54'screwed1nto the part 19 and having its innerend engaging in a groove or recess 54 formed inone side of the rod 18, as best seen in Fig. 5, and the lower pressuresustaining members are suitably retainedwithin the supporting rings 56 and "57, or in any preferred manner. 55 is'a' hole'throughthe lower part of 'thescrew 19" wherein a tool or spanner may be inserted to turn'and' adust said screw.

It is thought that the lHVQIltlOI'lZtIlCl1113.11) of itsattendant advantages willbe-unden stood from the foregoing descriptiomand it will be apparent thatvariouschan'ges may be made in" the form, construction andtarrangem'ent of the parts withoutdeparting from the spirit and scope of the'invent-ion or sacrificing all of its material advantages,

lya'preferred embodiment"thereof.-

I claim Y 1. An emergency stopping? device for presses and the like, comprising a die bottom and pressure sustaining members, a detector rod extending therethrough andhaving an end in position tobeoperatedby pressure of a predetermined numbervof -blanks in the press and means operated by. said" detector ,rod for automatically terminating the ac tion of the machine. I

2. An emergency stopping device for presses and the like,}comprising a die "bottom and' pressure sustaining members, afde presses and the like,'comprisinga die bottom and pressure sustaining members, a detector rod extending therethrough and-having an end in position to be operatedby pressure of a predetermined number of'bla'nks in the press,- an operating control member'14 adapted to be locked in position to cause continued action of the machine, andmeansyope'rated by movement of said detector rod for releasing said control member and terminating the action of the. machine, said -means'. comprising a spring pressed lever. 38 connected with said control member, av pawl 48. normally holding said lever in locked position described being mere-'- last mentioned means for terminating the ac from p r tive P n h r y 0 termi V cessive number of blanks being fed thereto.

While the machine is operating, and a release 6. An emergency stopping" device for member 33 carrying said pawl and operable presses and the like, comprising a female by movement of said rod. die resting upon pressure absorbing mem- 2' 4. An emergency stopping device for bers, means extending through said die, said presses and the like, comprising bottom die means being actuated by a predetermined and pressure sustaining members under the excess of pressure upon said die, said means bottom die, a rod extending through said acting upon mechanism for automatically members and operable by pressure of a pre- S opping the press. 30 determined number of blanks in the press 7. An emergency stopping device for and means operated by said rod for autopresses and the like, comprising means for matically terminating the action of the masustaining blanks, detecting means extending chine. into position to be automatically influenced 5. An emergency stopping device for by an excessive numberof said b1anks,'an presses and the like, comprising means for operative control adapted to be setto cause 7 sustaining blanks, means extending into 30- continued operation of the machine, and sition on the blank-sustaining means to be mechanism Comprising a holding and releas automatically influenced by the pressure of p wl and a spring which is confined un- 7 said blanks, and mechanism comprising a der pressure by said pawl, op ra by i 40 holding and releasing pawl operated by said ing m ans and moving said control tion of the machine in the event of an ex-' Hate the action of themachineQ HENRY o. s'roLn, 

